dc2019q - VeryAndroidoso
This was a jeopardy challenge, part of dc2019q. (CTFtime)
Was solved by: 33 teams
With the right flag, it will print 'Success!' on the screen and on logcat. Good Luck!
Reverse engineering and Frida is a valid way to solve this challenge, and many teams opted to do this.
However, this challenge is also solvable using angr's symbolic execution -- see the author's writeup for hints on this route.
None yet :(
If you wish, you can contribute some.
There's an author-recommended writeup.